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Class Information
Number: 137/403
Name: Fluid handling > Liquid level responsive or maintaining systems > By weight of accumulated fluid
Description: Apparatus in which the liquid level is sensed by means responsive to the weight or pressure head of the accumulated liquid.










Sub-classes under this class:

Class Number Class Name Patents
137/406 In communicating measuring vessel 9
137/408 In gravitating tank 16
137/404 In sinking or bucket type float 10
137/405 Oil burner fuel overflow preventing safety cut-offs 2


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
7811450 Swirl chamber with movable non-return valve and air injector for prevention of sedimentation in storm water and waste drains Oct. 12, 2010
7523761 Device for controlling fluid flow from a tank Apr. 28, 2009
7395633 Rainwater collection and diverging system Jul. 8, 2008
7219468 Automatic watering device for hanging baskets and planter boxes May. 22, 2007
6644344 Method and apparatus for metering a flow rate of a fluid Nov. 11, 2003
6640828 Flushing apparatus and method thereof Nov. 4, 2003
6340030 Apparatus for metering a plurality of different liquid or pasty materials Jan. 22, 2002
6276005 Water recycling device Aug. 21, 2001
6230730 Container having collapsible inline fluid-weight control device May. 15, 2001
6036446 Fluid transfer with concurrent system movement for liquid and vacuum Mar. 14, 2000
6026837 Automated chemical drain system Feb. 22, 2000
5887609 Container having fluid-weight control device Mar. 30, 1999
5871027 Vacuum valve controller Feb. 16, 1999
5842498 Mounting adapter and assembly for rendering fill valves for tank-type instantly dismountable Dec. 1, 1998
5829465 Container having fluid-weight control device Nov. 3, 1998
5752498 Elliptical beam load cell May. 19, 1998
5743290 Multi-purpose automatic filling and leveling liquid basin with liquid transfer Apr. 28, 1998
5722961 Flow control device for use with an intravenous set Mar. 3, 1998
5657494 Toilet flushing device Aug. 19, 1997
5655232 Fluid level control device and method Aug. 12, 1997
5653255 Sewage treatment system Aug. 5, 1997
5615701 Vacuum valve control device and vacuum valve Apr. 1, 1997
5588458 Vacuum valve controller for vacuum sewer system Dec. 31, 1996
5563584 Liquid level sensing and monitoring system for medical fluid infusion systems Oct. 8, 1996
5535774 Apparatus for storing and supplying water for use in catering equipment Jul. 16, 1996
5531241 Condensate trap and drain for systems under pressure Jul. 2, 1996
RE35283 High efficiency water distiller Jun. 25, 1996
5361795 Furnace waste water freeze protection method Nov. 8, 1994
5360412 Method and device for regulating intravenous flow Nov. 1, 1994
5358000 Siphon pump having a metering chamber Oct. 25, 1994
5259427 Package system for collection-transport of waste liquids Nov. 9, 1993
5201342 Pulsator device Apr. 13, 1993
5154205 Method and apparatus for maintaining level of water in above-ground swimming pools Oct. 13, 1992
5069243 Liquid level control system Dec. 3, 1991
5038831 Flood stopper for drain systems Aug. 13, 1991
4996726 Accelerated rim wash for a toilet Mar. 5, 1991
4977923 Pilot-controlled water pressure-operated diaphragm shut-off valve Dec. 18, 1990
4973402 Flow restrictor and strainer assembly for a toilet tank fill valve and the like Nov. 27, 1990
4960152 Device for compensating by supplying a measured amount of fluid and its application for replenishing a hydraulic circuit Oct. 2, 1990
4945944 Fill valve for toliet tanks Aug. 7, 1990
4894123 High efficiency water distiller Jan. 16, 1990
4887635 Fluid fill valve with accurate fill level mechanism Dec. 19, 1989
4821766 Toilet tank fill valve Apr. 18, 1989
4770345 Irrigation control valve system Sep. 13, 1988
4762176 Air-water separator Aug. 9, 1988
4684379 Air cleaner assembly Aug. 4, 1987
4655243 Automatic pool filler Apr. 7, 1987
4630628 Flow control apparatus Dec. 23, 1986
4603709 Device in a vacuum transportation system for liquids, preferably a vacuum sewage system Aug. 5, 1986
4574826 Adjustable vacuum breaker fill valve Mar. 11, 1986

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